Wow, I would have have never thought about this peril relative to cars in spite of the fact that throughout the years those little bastards chewed just about everything else in our garage. I have all of those d-con pellets in multiple places, as well as various other so-called deterrents, as well as traps, etc.. I got rid of a few of them but others seem replace them, and it's a never ending problem.
Everyone swears by cats being the ONLY solution. So going out to buy a cat and I'm keeping it in the white glove engine over compartment 24/7. :-) ..after I line up the box with catnip.
( and for those of you thinking " wait, but you have a 94 so no white glove box for you ! " ..I bought the engine cover separately )